Levo Gen 3 can't turn on for 5 mins after plugging it in

[rzr]

Levo g3, doesn't want to turn on for first 5 mins after plugging it in (after charging).
reconnecting doesn't help (tried many times), but just waiting 5-10mins (With battery already connected) helps.
I don't see any moisture on the connector/plug or seals.

any ideas ?